\subsection{Notation}
\begin{table}[h!]
  \begin{center}
  \begin{tabular}{|l|p{8cm}|}
    \hline
    $\mbf{B}^e$ & Element strain-displacement matrix\\
    $\mbf{C}$ & Elastic constitutive matrix\\
    $\mbf{r}$ & Displacement vector\\
    $\mbf{r}^e$ & Element displacement vector\\
    $\hat{\mbf{r}}$ & Global displacement vector\\
    $\mbf{K}$ & Stiffness matrix\\
    $N_i^e$ & Element shape function\\
    $\mbf{n}$ & Exterior unit normal vector\\
    $\Gamma$ & Domain boundary\\
    $\Gamma_u$ & Dirichlet boundary\\
    $\Gamma_t$ & Neumann boundary\\
    $\delta_{ij}$ & Kronecker symbol\\
    $\mbf{\eps}$ & Infinitesimal deformation tensor\\
    $\nu$ & POisson's ratio\\
    $\mbf{\sigma}$ &Cauchy stress tensor\\
    \hline
  \end{tabular}
  \end{center}
  \caption{Table of symbols}
\end{table}
